1.David Rowland

Property Tycoon David Rowland is the biggest donor. He has given a staggering £4,031,036 for various campaigns over the last two years.

The former tax-exile was due to succeed Michael Spencer as Tory treasurer until he stood down after a hostile media campaign said to have been led by opponents in the Tory party. Rowland also claimed that he was uncomfortable with the intense scrutiny that comes with the job.

Multimillionaire Rowland, worth £730million is notoriously camera-shy - despite once persuading Prince Andrew to unveil a bronze statue of him in his palatial home, Guernsey.

One of the few available pictures of him is from 1971 after he had returned from Paris where he lived as a tax-exile after after selling his interests in Fordham Investment Group for £2.4m.

2.Michael Farmer

In the city Michael Farmer has become known as 'Mr Cooper'. He is the second biggest donor having given £2,973,850 to the Tories.

In the 1990s he turned his firm MG Metals into the world's biggest copper trader. After floating the company on the London Stock Exchange he received a massive cash bid from Enron for 60 per cent more than the asking price.

Farmer earned tens of millions from the deal but the company crashed amid fraud problems.

After taking two years off to study the bible, he founded RK Capital Management, currently one of the world's biggest industrial metal hedge funds.

'I'm giving away money to the conservatives because I believe they will be a far better government than Labour', he said last year. 'I've always tried to keep a low profile but this is important'.

3.Stanley Fink

Known as 'the gofather' of the UK hedge fund industry, Stanley Fink is the Conservative party treasurer. He has donated £1,945,141.

Having built up the Man Group into one of the world's largest hedge funds, Fink has a personal fortune estimated at £120m.

Fink, who was educated at Manchester grammar school and then Trinity Hall Cambridge, shrewdly stepped down from the Man Group shortly before the financial crash in 2008.

Outside of his donations to the Tory party, Fink is one of the biggest donors to charitable causes having given around £36m. These have increased after he was fought a brain tumour four years ago.

Notably, he backed Boris Johnson's cmapaign to become London Mayor.

4.Michael Hintze

Australian Michael Hintze has given £1,235,000 to the Conservatives. After founding the hedge fund CQS in 1999, Hintze is estimated to be worth more £1bn according to the Forbes rich list.

Hintze first moved to the US after a stint in the Australian army. There he settled on a career in Wall Street and quickly progressed up the ranks.

After moving to London with Credit Suisse First Boston he defected to Goldman Sachs where he became head of equiity trading. As one of the banks star performers he quickly became a multimillionaire.

Apart from the Tory party, Hintze is a regular giver to the arts in London. He supports the Old Vic theatre, the V&A museum and Wandswoth museum.

Financiers and hedge fund firms gave the Tory party a total of £11.4million in the first ten months of last year – 50.8 per cent of all donations, according to the investigation. In 2005, the financial sector accounted for just 25 per cent.

The City has handed the Tories almost £43million since 2005, out of a total of just over £101million of donations from all sources.

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It will raise questions about the party’s dependence on the financial sector for cash at a time when Mr Cameron and Chancellor George Osborne are being criticised for going soft on reforms of the financial sector.

Wealth: David & Samantha Cameron arriving at the Black and White Ball in Battersea Park which was attended by mega-rich bankers

Details of the donations came in a report by the Bureau of Investigative Journalism as UK banks prepare to announce combined bonuses of £6billion for last year and amid forecasts that the top five banks will rake in £51.7billion of profit this year.

It means the £800million additional tax levy Mr Osborne imposed on the banks yesterday amounts to less than the £1billion profit they will rack up in a week.

Ten publicity-shy City tycoons have donated more than £13million between them to the Conservatives since 2005, the findings show.

The biggest, property tycoon David Rowland, quit as Tory treasurer last summer amid controversy over some of his past business dealings.

The listing does not include donations from former Tory treasurer Michael Ashcroft, whose funding was directed largely at a local level.

The research shows that 57 individual City tycoons each gave more
than £50,000 in 2010, giving them numerous opportunities to meet Mr
Cameron and other senior figures at dinners and receptions.

Iain
Overton, editor of the Bureau of Investigative Journalism, said the
level of funding from the City raises questions over whether Mr Cameron
and Mr Osborne can ‘separate the interests of their wealthy backers from
the wider national interest’.

A Conservative Party spokesman said: ‘On
the day the Chancellor raised another £800million in tax from bankers it
beggars belief that anyone could claim Conservative donors are
influencing policy.

‘It would be more pertinent to ask why Labour continued to allow
their policy to be dictated by the unions, who provide 80 per cent of
their funds.’